Separator.



A: J. xommm.

SEPARATOE.

APPLIOATION P'ILED MAY 13, 1907.

Patented Dec. 29,- 1908.

2 SHEETS-SHEET 1.

atboznurk umans-11mins PATENT ornron ABRAM' J. KOISTINEN, OF BRYANT,SOUTH DAKOTA.

SEPARATOR.

Specification of Letters Patent.

Patented Dec. 29, 1908.

Application filed May 13, 1907.Seria1 I Io. 373,431.

This invention relates to grain separators and has for its object toprovide a simple but very efficient mechanism of the class stated.

One of the novel features of the invention resides in the rovision of asieve which is 7 arranged in a 'rame, and an apron or conveyer which isarranged for travel above the sieve and serves to force grain of acertain size through the openings in the sieve, the grain beingdelivered to mechanism at one end of the sieve upon a board which isadapted to direct it between the sieve and the conveyer after which itis drawn over the sieve toward the op osite end thereof. 7

A further novel feature of the invention lies in the form of drivingmeans employed for the conveyer, there being means for adjusting thetension of the drive belt and the conveyer belt so that the workperformed by the mechanism under different conditions will be uniformlysatisfactory.

In the accompanying drawings, Figure 1 is a top plan view of the searator, Fig. 2 is a bottom plan view thereo Big. 3 is a side elevation,liig. 4' is a vertical longitudinal sectional view taken centrallythereof, and,

Iig. 5 is a similar view taken through one of the devices for adjustingthe tension of the conveyer belt.

As shown in the drawings, the separator comprises a frame including sidesills 6 and connecting sills 7, which are secured at their ends to theundersides of the side sills adjacent their ends. thus formed and in aplane with the under sides of the side sills is a sieve or screen 8which is in the form of a foraminous plate, it being understood ofcourse that the said sieve extends from one to the other of the sidesills and likewise from one to the other of the connecting sills. Agrain board 9 is arranged in inclined position at the forward variousadjustments.

Arranged in the frame end ofthe frame and extends from one to the otherof the said side sills and is so positioned that grain de osited thereonwill be directed, by reason 0 the inclination of the board, onto thesieve.

A shaft 10 carrying a roller 11 is journaled in the side sills of theframedirectly above the lower edge of the grain board and a shaft 12,carrying a roller 13, is journaled in suitable bearings 14 upon the rearends of blocks 15 at the rear end of the frame. These blocks areprovided with slots 16 through which are engaged bolts 17 having engagedthereon nuts 18, these bolts serving as a means whereby the blocks maybe held at In order to lateral movement of the blocks, t ey arebifurcated at their forward ends as at 19 forv the reception of headedstuds 20 upon the upper edges of theside sills of the frame. At theirrear ends, the blocks are provided with depending ortions 21 which, whenthe blocks are at the imit of their forward adjustment, abut the rearends of the corresponding I side sills.

An endless conveyer belt 22 is engaged over the rollers upon thetwoshafts above described, and the under stretch of this belt is designedto travel over the upper face of the sieve in contact therewith so as todrag the grain de osited upon the sieve, from the front en thereof tothe rear end.

A grooved pulley 23 is fixed upon the shaft 12 and over this pulley anda similar pulley 24 carried by a drive shaft 25 is engaged a drive belt26.

Loosely mounted for rocking movement upon the shaft 12 is an angle leverat the end of one armof which is journaled a roller 27 over which thedrive belt also passes and to the other arm of this lever is pivotallyconnected one end of a connecting rod 28 which leads from a lever 29pivotally mounted upon one of the side,sills of the frame, it beingunderstood that'this lever may be rocked to cause the roller to bearmore or less firmly against the drive belt to adjust the tension of thesame.

What is claimed is:

In.a separator, a su porting frame consisting of side sills, a rollerjournaled therebetween adjacent to one end thereof; blocks slidablymounted on the sills at the other revent

